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Equity (Share-based Payments to Employees, Non-marketable Options, Number of Options Vested) (Details)
Pure in Millions
Dec. 31, 2017
USD ($)
Dec. 31, 2017
ILS (₪)
Dec. 31, 2016
USD ($)
Dec. 31, 2016
ILS (₪)
Dec. 31, 2015
USD ($)
Dec. 31, 2015
ILS (₪)
Notes to Consolidated Financial Statements [Abstract]            
Number of options exercisable (In Millions) 12 12 10 10 11 11
Weighted average exercise price $ 6.51 ₪ 22.56 $ 7.93 ₪ 30.49 $ 10.44 ₪ 40.74